Excitonic Creation of Highly Luminescent Defects In Situ in Working Organic Light-Emitting Diodes

被引：6

作者：

Zhao, Yong-Biao ^{[1
,2
]}

Ingram, Grayson L. ^{[1
]}

Gong, Xi-Wen ^{[2
]}

Li, Xi-Yan ^{[2
]}

Quan, Li-Na ^{[2
]}

Li, Pei-Cheng ^{[1
]}

Xie, Jia-Qi ^{[1
]}

Sargent, Edward H. ^{[2
]}

Lu, Zheng-Hong ^{[1
,3
]}

机构：

[1] Univ Toronto, Dept Mat Sci & Engn, 184 Coll St, Toronto, ON M5S 3E4, Canada

[2] Univ Toronto, Dept Elect & Comp Engn, 35 St George St, Toronto, ON M5S 1A4, Canada

[3] Yunnan Univ, Dept Phys, Kunming 650091, Yunnan, Peoples R China

来源：

ADVANCED OPTICAL MATERIALS | 2018年 / 6卷 / 02期

基金：

加拿大自然科学与工程研究理事会; 加拿大创新基金会; 中国国家自然科学基金;

关键词：

degradation; excitons; luminescent defects; organic light-emitting diodes; thermally activated delayed fluorescence; ACTIVATED DELAYED FLUORESCENCE; HOLE-TRANSPORT; ELECTROLUMINESCENT DIODES; DEGRADATION MECHANISMS; DEVICES; FILMS; CONFINEMENT; STABILITY;

D O I：

10.1002/adom.201700856

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Excitons play the central role in organic optoelectronic devices. Efficient exciton-to-photon and photon-to-electron conversion promote quantum yield in optoelectronic devices such as organic light-emitting diodes and organic solar cells. Exciton-related reaction products and defects in working devices have previously been viewed as fatal to stability. Here, the utilization of these excitonic reactions to create luminescent defects with extremely high (6.7%) external quantum efficiency in an operating device containing 1,1-bis((di-4-tolylamino)phenyl) cyclohexane (TAPC) is reported. Transient photoluminescence reveals a long delayed fluorescence lifetime (2.7 mu s) from these emissive defects, indicating that they exhibit thermally activated delayed fluorescence. It is shown that the functional group of tri-p-tolylamine (TPTA) follows similar processes as TAPC, suggesting that the chemical nature of the observed luminescent defects is directly related to TPTA.

引用

页数：6

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